Note: The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.Note: Click for Watch Status Reports.

SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 18
NWS STORM PREDICTION CENTER NORMAN OK
200 PM EST WED FEB 11 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST INDIANA
EASTERN KENTUCKY
SOUTHERN OHIO
EASTERN TENNESSEE
EXTREME SOUTHWEST VIRGINIA
WESTERN WEST VIRGINIA INCLUDING THE NORTHERN PANHANDLE
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
900 PM EST.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF ZANESVILLE
OHIO TO 35 MILES SOUTHEAST OF KNOXVILLE TENNESSEE. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 16...WW 17...
DISCUSSION...LINE OF LOW-TOPPED CONVECTION IS RACING EASTWARD ACROSS
KY/TN AHEAD OF 130+ KNOT MID LEVEL JET MAX. DESPITE VERY LIMITED
INSTABILITY...EXTREMELY STRONG FORCING AND WIND FIELDS WILL PROMOTE
A RISK OF WIDESPREAD WIND DAMAGE ALONG LEADING EDGE OF CONVECTION.
ISOLATED AND BRIEF TORNADOES WILL ALSO BE POSSIBLE IN BOW/LEWP
STRUCTURES ALONG LINE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
350. MEAN STORM MOTION VECTOR 25045.
...HART

SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 18
NWS STORM PREDICTION CENTER NORMAN OK
200 PM EST WED FEB 11 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST INDIANA
EASTERN KENTUCKY
SOUTHERN OHIO
EASTERN TENNESSEE
EXTREME SOUTHWEST VIRGINIA
WESTERN WEST VIRGINIA INCLUDING THE NORTHERN PANHANDLE
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 200 PM UNTIL
900 PM EST.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF ZANESVILLE
OHIO TO 35 MILES SOUTHEAST OF KNOXVILLE TENNESSEE. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU8).
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
OTHER WATCH INFORMATION...CONTINUE...WW 16...WW 17...
DISCUSSION...LINE OF LOW-TOPPED CONVECTION IS RACING EASTWARD ACROSS
KY/TN AHEAD OF 130+ KNOT MID LEVEL JET MAX. DESPITE VERY LIMITED
INSTABILITY...EXTREMELY STRONG FORCING AND WIND FIELDS WILL PROMOTE
A RISK OF WIDESPREAD WIND DAMAGE ALONG LEADING EDGE OF CONVECTION.
ISOLATED AND BRIEF TORNADOES WILL ALSO BE POSSIBLE IN BOW/LEWP
STRUCTURES ALONG LINE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
350. MEAN STORM MOTION VECTOR 25045.
...HART

For each watch, probabilities for particular events inside the watch (listed above in each table) are determined by the issuing forecaster. The “Low” category contains probability values ranging from less than 2% to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities), “Moderate” from 30% to 60%, and “High” from 70% to greater than 95%. High values are bolded and lighter in color to provide awareness of an increased threat for a particular event.

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